Not long ago, one of my students asked: “So, if my phone tells me the Russians have used nuclear weapons in Ukraine, should I do anything different here?” In other words: should I head for the hills?

My answer is “no.” The U.S. and Russian governments know full well that lobbing nuclear weapons at each other would be suicidal—each has enough powerful, survivable nuclear weapons to obliterate the other as a functioning society. No one is going to march down that road on purpose.

But it’s a nervous “no,” because the key lesson of the crises of the last several decades is that there is a fog of crisis, just as there is a fog of war, and things can happen that no leader originally intended. And in this case, thinking about how the United States might respond to Russian nuclear use makes clear just how rapidly things could get very dicey.

The Belfer Center Communications Team reached out to policy experts John P. Holdren and Matthew Bunn to reflect on the recent achievement of fusion ignition at the Lawrence Livermore National Laboratory. 

In late October, after eight months of war, the Russian government claimed that Ukraine was preparing to use a "dirty bomb" and blame it on Russia. There was never any evidence for this claim. But Russia's ambassador to the UN, Vassily Nbenzia, nevertheless sent a letter (reproduced below) demanding that the Security Council hold a meeting to discuss the "dirty bomb" issue.

Russia's claims have been widely dismissed. Nevertheless, Russian spokesmen are continuing to press the narrative.  (See, for example, the November 8 statement from Anatoliy Antonov, Russia's ambassador to the United States, which slurs together with the dirty bomb theme a variety of other false claims about Ukraine.) It seems worthwhile, therefore, to debunk Russia's claims in detail.

Former Soviet leader Mikhail S. Gorbachev, who is known for ending the Cold War, dissolving the Soviet Union, and changing the map of Europe, died Tuesday, August 30. He was 91.

We asked several Center experts for their thoughts on Gorbachev and his impacts – and how his life and actions are relevant to the challenges the world faces today.

The Project on Managing the Atom participated as a NGO delegation in the Tenth Review Conference of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) at the United Nations in New York. This review conference comes at a time when nuclear fears amid the conflict in Ukraine loom large.

Along with concerns over the possible deployment of tactical nuclear weapons, the Biden administration is now warning that the Russian military may launch a chemical weapons attack in Ukraine. Russia has used chemical weapons during past conflicts, notably in Chechnya and Syria, in violation of international law. Russian officials denied Biden’s accusation during a U.N. Security Council meeting Tuesday.

The Kremlin is claiming that Ukraine is developing nuclear weapons. Like most of Russia’s other pretexts for invading Ukraine, this is dangerous nonsense. In his February 21 war speech, Russian President Vladimir Putin stated that Ukraine possesses delivery systems and nuclear technologies inherited from the Soviet Union and that, with foreign support, “it is only a matter of time” before Ukraine creates nuclear weapons. Echoing this concern, Russian Foreign Minister Sergei Lavrov in his address to the Conference on Disarmament on March 1, alleged that Ukraine “started dangerous games related to plans to acquire their own nuclear weapons.”

Belfer Center experts in security, intelligence, cyber, nuclear, and energy offer analysis and insight into Russia's invasion of Ukraine. 

The hard truth is that the United States now has few good options for containing Iran’s nuclear program. It can persist with the no-deal status quo, allowing Iran to continue inching closer to a bomb while suffering under sanctions. It can pursue a return to the 2015 agreement and then attempt to get Iran to agree to a “longer and stronger” pact, as the Biden team has suggested. It can try for various other deals, either more or less stringent than the 2015 agreement. Or it can attempt to destroy Iran’s nuclear infrastructure with a military strike, possibly setting Tehran’s progress toward a bomb back by a few years but almost certainly provoking retaliation and possibly a sprint toward the nuclear finish line.

• U.S.-Russia Elbe Group Maintains Focus on Threat of Nuclear Terrorism.
• Former Chernobyl Plant Manager Bryukhanov Dies.
• Matthew Bunn on Threat to Nuclear and Radiological Transports.
• On 9/11 Anniversary Russian Officials Call for Resumption of U.S.-Russian CT Cooperation.
• Experts Weigh in on 9/11 Anniversary.
• U.S. and Norway Agree to Eliminate All of Norway’s HEU.
• Two Soviet Nuclear Submarine Reactors Located.
• Russian Security Council: Terrorists Remain Interested in NBC.
• IAEA Adopts Resolutions on Nuclear Security, NS Center Planned.
• Allison on Risk of Mega-terrorist Attack After U.S. Withdrawal From Afghanistan.
• Arbatov Warns of Enduring Threat of Nuclear Terrorism to Russia in His New Volume.
• Russia’s New Security Strategy Drops References to CT Partnership With U.S.
• NNSA’s Non-Proliferation Budget to Decrease in ’22, Provides for US and Russian Visits.
• Should U.S.-Russian Interaction in Cyberspace Involve CT? 
• Russia’s NPP Operator Conducts Emergency Preparedness Exercise.
• Putin and Biden Discuss Terrorist Threat Emanating from Afghanistan, but No Deal.
• U.S. Experts on Ensuring Access to Neutrons While Reducing Nuclear Terrorism Risks.
• Beebe Weighs in on U.S.-Russian CT Interaction.
• Duo Detained for Alleged Attempt to Sell Americium-241.
• 12th GUMO Guard’s Sentence Upheld.
• NDAA-Mandated Group to Identify Nuclear Terrorism Risks.
• Belfer’s MTA Hosts Conference on Lessons of Fukushima and Chernobyl.
• Russia Withdraws from Uranium Hexafluoride Transportation Deal with U.S.
• Bell: U.S. Needs to Convince Russia on Contending With Nuclear Terrorism Threat.
• U.S. and Canada Complete Repatriation of HEU Material.
• Siegfried Hecker Outlines his Vision of Future for Nuclear Security Cooperation.
• Hackers Breach U.S. Nuclear Agency.
• Tobey on Assassinations of Nuclear Scientists and Terrorists.
• Rosatom Has Checked Nuclear Sites, Following a Tip on Terrorism from U.S.